— 58 — 



high magnification. (Cut out a piece and mount in glycer- 

 ine, or dry, on a glass slide.) Notice the hexagonal shape 

 of the facets. 



Simple eyes. — There are no simple eyes ; assure yourself 

 of their absence by examination. 



Clypeus. — The cephalic aspect of the head is made up 

 chiefly of the rounding, tumid, shield-shaped clypeus. It 

 extends dorsad to the antennary fossae, and as a short, broad 

 tongue between them to a distinct suture extending trans- 

 versely from fossa to fossa. Ventrad the clypeus is bounded 

 by a subtransversely-running suture curving slightly dorsad 

 in its lateral portions. Ventrad of the mesal part of the suture 

 is the labrum ; and latero-ventrad of the lateral parts of the su- 

 ture are triangular expansions of the genes. The part of this 

 suture lying between the latero- ventral angles of the clypeus 

 and the triangular expansions of the genae is especially dis- 

 tinct, and in bleached specimens shows a noticeable expan- 

 sion at a point from which the suture running dorsad is 

 represented only by a raised line or sutural ridge. Laterad 

 the clypeus is separated from the gense (those narrow por- 

 tions of the genae which form the mesal orbits of the eyes) 

 by the sutural ridge just mentioned. 



Epicranium. — The epicranium comprises a much smaller 

 proportion of the front of the. head than in the locust. It 

 composes most of the dorso-cephalic, dorsal, and dorso- 

 caudal aspects of the head. It is a suboblongate sclerite 

 with its "bounding sutures largely obsolete. A short, broad 

 tongue projects cephalad between the antennae meeting the 

 dorso-caudad-projecting tongue of the clypeus, but separated 

 from it by the short transversal suture. The epicranium 

 presents a tumid transverse space on the caudal aspect of 

 the head, ending in two, tumid, whitish spots. 



Between the clypeus and the eyes are the narrow elon- 

 gated gencE. They compose the cephalic and part of the 



